World War 2 was a most global conflict battle against Geman war machine and Empire of Japan. The battle starts at 1st of September 1939, when the German army starts to invaded in Poland and 6th October, the Polish Army was defeated at the Battle of Kock in Poland, the German and Soviet Army gained full control over Poland.
top left: Battle of Stalingrad. 23rd of August 1942.
top right: Battle of Normandy. 6th of June 1944.
down left: Battle of Peleliu. 15th of September 1944.
down right: Battle of the Bugle. 16 December 1944.